Amplifying circuit and rectifying antenna

An amplifying circuit, comprising:

• a first rectifying circuit, configured to output a first direct current signal according to a first alternating current signal;
• a second rectifying circuit, configured to output a second direct current signal according to a second alternating current signal;
• a differential amplifying circuit, configured to receive the first direct current signal and the second direct current signal, amplify a difference between the first direct current signal and the second direct current signal, and output an amplified difference between the first direction current signal and the second direct current signal,
• wherein the first direct current signal and the second direct current signal have directions opposite to each other, the first rectifying circuit comprises at least one of a first band-pass filter and a first low-pass filter,
• the first rectifying circuit comprises a first input terminal configured to receive the first alternating current signal, and a first output terminal configured to output the first direct current signal;
• and the second rectifying circuit comprises a second input terminal configured to receive the second alternating current signal, and a second output terminal configured to output the second direct current signal,
• the first rectifying circuit further comprises a first rectifier connected between the first input terminal and the first output terminal, and the first rectifier is configured to perform a half-wave rectification on the first alternating current signal as received, to output a first pulsating direct current signal;
• the second rectifying circuit further comprises a second rectifier connected between the second input terminal and the second output terminal, and the second rectifier is configured to perform a half-wave rectification on the second alternating current signal as received, to output a second pulsating direct current signal;
• wherein the first pulsating direct current signal and the second pulsating direct current signal have directions opposite to each other,
• the first rectifying circuit further comprises the first band-pass filter and the first low-pass filter;
• the first band-pass filter is connected between the first input terminal and the first rectifier, and is configured to perform a band-pass filtering on the first alternating current signal input from the first input terminal, and output a band-pass filtered signal to the first rectifier;
• and
• the first low-pass filter is connected between the first rectifier and the differential amplifying circuit, and is configured to perform a low-pass filtering on the first pulsating direct current signal output by the first rectifier to output the first direct current signal.